What's the easiest way to get from Lille to Haspres?

I couldn't find a rail line on that route. You could contact Rail Europe and see if such a line exists. Having toured around the North of France visiting places my Great Uncle went to, I found driving a much easier option. It meant I could visit other places of interest easily. If you can, catch the last post ceremony at Ypres on at 8.00p.m. every evening. Very moving.